TC2001 datasheet(18/34 Pages) TRIPATH

18 / 34 page

Tr i p ath Technol ogy, I n c. - Techni cal In fo rma t io n

TK2150 – Rev. 1.0/12.02

The TC2001 incorporates a differential feedback system to minimize the effects of ground bounce

and cancel out common mode ground noise. As such, the feedback from the output ground for

each channel needs to be properly sensed. This can be accomplished by connecting the output

ground “sensing” trace directly to the star formed by the output ground return, output capacitor,

CO, and the zobel capacitor, CZ. Refer to the Application / Test Circuit for a schematic

description.

TK2150 Amplifier Gain

The gain of the TK2150 is the product of the input stage gain and the modulator gain for the

TC2001. Please refer to the sections, Input Stage Design, and Modulator Feedback Design, for a

complete explanation of how to determine the external component values.

MODULATOR

VINPUTSTAG

VTK2150













−

≈

)

FBB

FBA

FBB

FBA

FBC

VTK2150

For example, using a TC2001 with the following external components,

RI = 20kΩ

RF = 30.1kΩ

RFBA = 1kΩ

RFBB = 1.1kΩ

RFBC = 10.0kΩ

13.35

1.1k Ω

1.0k Ω

)

1.1k

(1.0k Ω

10.0k Ω

30.1k Ω

20k Ω

AVTK2150













Ω

−

≈

Input Stage Design

The TC2001 input stage is configured as an inverting amplifier, allowing the system designer

flexibility in setting the input stage gain and frequency response. Figure 2 shows a typical

application where the input stage is a constant gain inverting amplifier. The input stage gain

should be set so that the maximum input signal level will drive the input stage output to 4Vpp.

The gain of the input stage, above the low frequency high pass filter point, is that of a simple

inverting amplifier:

VINPUTSTAG

−

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